"A Storm" is a sumptuous pastel that captures the awesome sight of a raging electrical storm over water. O'Keeffe created a jolting contrast between the deep blue pastel of the water and sky, smudged and velvety, and the sharp angular bolt of red lightning outlined in yellow. This dramatic scene, which she most likely witnessed at Lake George, includes the surprising appearance of a full moon reflected in the lake at lower left. Although O'Keeffe's pastels were exhibited often during the 1920s and 1930s, they represent a less familiar aspect of her oeuvre.
[https://metmuseum.org/art/collection/search/482299]